bump bootswatch to 3.1.0+1, add lumen and superhero themes
Add missing `btn-default` class.

Thanks @thomaspark for the hint!
Merge pull request #297 from MaxCDN/bootswatch-3.1.0+1

bump bootswatch to 3.1.0+1, add lumen and superhero themes
[#301] Increasing mocha timeout to fix false fails.
Merge pull request #300 from XhmikosR/develop

Add missing `btn-default` class.
Merge pull request #303 from MaxCDN/develop

Release for #297 & #300


... make is so.